Dump(8) does not do incremental

[Olivier Nicole]

Thanks Warren,

>> Is there any reason why dump would not do incremental when used with -f -?
> -u to update /etc/dumpdates after a success?

That was it. But I now wonder what was the twisted reason behind that
behaviour (that is not documented, man pages mention the various
levels, not saying they are not working unless -u); I understand one
may want to not implement the incremental dumps, but the default
should enable them.

Best regards,

olivier